Located 5 kilometers south of Shanhaiguan District, Qinhuangdao City, Laolongtou is the eastern starting point of Jizhen Great Wall in Ming Dynasty. It is also the only land-sea military defense system of the Great Wall integrating mountains, seas, customs and cities. In the vicissitudes of more than 600 years, Laolongtou has written a history of many vicissitudes. The Great Wall of the Ming Dynasty spanned steep mountains and meandered a huge dragon into the Bohai Sea, so the first name of the Great Wall was quot; the old leader was quot;. The old dragon head consists of Shicheng, Jinghuatai, Nanhaikouguan and Chenghai Tower. It is worth visiting for its scenery, interest and human history. But Old Dragon Head. Old Dragon Head, no matter how aggressive you are, you can't stop Dolphin's iron riding. Climbing up Chenghai Tower, looking at the "Chengshan Tour" of Weihai in the south, stretching out to the sea, and eventually becoming the landing wharf of Japanese aggression against China. Only Jiayuguan, a brothers echoing from thousands of miles away, one in the East and one in the west, seems to have no reason to speak.